you and i need to play an around the world match to do some of our testing. ive got a number of theories i need to test in a map that size as well!!
i had a thought about why mines and smelters are not joined, and i think it simply has to do with logistics. on a planet where diasters are frequent (as you said) and areas of danger may shift from day to day, it is better to have multiple mines feeding a single smelter via trucks which can simply be rebuilt. i think youre on to something, TH300. but i also think that having the advanced smelter would really add to the game in a logical way. i wouldnt be amazed if given the time, the game would have been shipped with this structure. it seems like almost every building in each faction has a basic, standard and advanced progression - except mines and smelters. common and rare ore types dont really count, imo. considering that the larger and more developed a base is, the more likely it is to begin taking more liberties with cost and upkeep. that being said, wouldnt it be likely that once a colony got to the point that its not struggling to survive, that it would some up with a more productive smelter? if said colony was developed enough to even consider it, they would likely have no problem building the extra power plants required to run the structure.
the more i think about this concept, the better it seems! we shouldnt have a problem writing the research entry for this addon, i think.